See this dialog response. Due to the lower altitudes of the jumps, BASE jumping is significantly more dangerous than skydiving from a plane. What came before?
A dialog between 2 people:
Speaker 1) What is BASE jumping?
Speaker 2) BASE jumping  BASE jumping, also sometimes written as B.A.S.E. jumping, is parachuting from a fixed structure .
Speaker 1) Where did the acronym come from?
Speaker 2) "BASE" is an acronym that stands for four categories of fixed objects from which one can jump: building, antenna, span, and earth (cliff).
Speaker 1) Is there anything else interesting in the article?
Speaker 2) 